Evaluation of Corrosion Resistance of Corrosion Inhibitors for Concrete Structures by Electrochemical Testing in Saturated Ca(OH)2 Solutions with NaCl and Na2SO4
Reinforcing steel maintains passivity in an alkaline concrete environment. However, the passive film on the steel can be destroyed as the concrete becomes acidic, which could induce the corrosion of reinforcing steel. Carbonates and sulfates destroy the concrete matrix and accelerate the penetration...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2019-01-01
|
| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2019/8294360 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832546114531753984 |
|---|---|
| author | Hwa Sung Ryu Chang Gil Lim Tae Won Kang Seungmin Lim Hong Tae Kim Sang Heon Shin |
| author_facet | Hwa Sung Ryu Chang Gil Lim Tae Won Kang Seungmin Lim Hong Tae Kim Sang Heon Shin |
| author_sort | Hwa Sung Ryu |
| collection | DOAJ |
| description | Reinforcing steel maintains passivity in an alkaline concrete environment. However, the passive film on the steel can be destroyed as the concrete becomes acidic, which could induce the corrosion of reinforcing steel. Carbonates and sulfates destroy the concrete matrix and accelerate the penetration of hazardous ions, thereby deteriorating the structure. To alleviate the corrosion of internal reinforcing steel within concrete, corrosion inhibitors are most widely used. In this study, the effects of inorganic nitrite (lithium nitrite) and amino acid corrosion inhibitors (diethanolamine, methyl diethanolamine, and 4-aminobutyric) on corrosion resistance and the pH of the solution with various concentrations of Na2SO4 (0.89, 1.77 g/L) in saturated Ca(OH)2 that contained NaCl (0.98 g/L), which simulated the concrete environment, were investigated. The corrosion resistance of inhibitors was evaluated by corrosion potential, electrochemical impedance spectroscopy, and potentiodynamic techniques. The results indicated improvement of corrosion resistance by the addition of amino acid corrosion inhibitors. It was confirmed that the inhibitor adsorbed on the surface of the specimen and passivated to reduce the corrosion reaction. In addition, the 4-aminobutyric acid corrosion inhibitors had the corrosion protection efficiency of 67.87–77.80%, which is a higher value than that of the inorganic nitrite corrosion inhibitor (lithium nitrite: 69.36–75.93%) and other amino acid corrosion inhibitors (diethanolamine: 35.69–39.91%; methyl diethanolamine: 66.07–69.09%). |
| format | Article |
| id | doaj-art-1d09855237a042389a9587d4480fb0c2 |
| institution | Kabale University |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-1d09855237a042389a9587d4480fb0c22025-02-03T07:23:51ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422019-01-01201910.1155/2019/82943608294360Evaluation of Corrosion Resistance of Corrosion Inhibitors for Concrete Structures by Electrochemical Testing in Saturated Ca(OH)2 Solutions with NaCl and Na2SO4Hwa Sung Ryu0Chang Gil Lim1Tae Won Kang2Seungmin Lim3Hong Tae Kim4Sang Heon Shin5Hanyang E&C, 55 Hanyangdaehak-ro, Sangnok-gu, Ansan, Gyeonggi-do 15588, Republic of KoreaSammyung E&C, 8 Jungang-daero 1473 Beon-gil Dongnae-ru, Busan 47711, Republic of KoreaSammyung E&C, 8 Jungang-daero 1473 Beon-gil Dongnae-ru, Busan 47711, Republic of KoreaDepartment of Architectural Engineering, Hanyang University, Ansan 15588, Republic of KoreaDepartment of Civil Engineering, Kyungpook National University, Deagu 41566, Republic of KoreaHanyang E&C, 55 Hanyangdaehak-ro, Sangnok-gu, Ansan, Gyeonggi-do 15588, Republic of KoreaReinforcing steel maintains passivity in an alkaline concrete environment. However, the passive film on the steel can be destroyed as the concrete becomes acidic, which could induce the corrosion of reinforcing steel. Carbonates and sulfates destroy the concrete matrix and accelerate the penetration of hazardous ions, thereby deteriorating the structure. To alleviate the corrosion of internal reinforcing steel within concrete, corrosion inhibitors are most widely used. In this study, the effects of inorganic nitrite (lithium nitrite) and amino acid corrosion inhibitors (diethanolamine, methyl diethanolamine, and 4-aminobutyric) on corrosion resistance and the pH of the solution with various concentrations of Na2SO4 (0.89, 1.77 g/L) in saturated Ca(OH)2 that contained NaCl (0.98 g/L), which simulated the concrete environment, were investigated. The corrosion resistance of inhibitors was evaluated by corrosion potential, electrochemical impedance spectroscopy, and potentiodynamic techniques. The results indicated improvement of corrosion resistance by the addition of amino acid corrosion inhibitors. It was confirmed that the inhibitor adsorbed on the surface of the specimen and passivated to reduce the corrosion reaction. In addition, the 4-aminobutyric acid corrosion inhibitors had the corrosion protection efficiency of 67.87–77.80%, which is a higher value than that of the inorganic nitrite corrosion inhibitor (lithium nitrite: 69.36–75.93%) and other amino acid corrosion inhibitors (diethanolamine: 35.69–39.91%; methyl diethanolamine: 66.07–69.09%).http://dx.doi.org/10.1155/2019/8294360 |
| spellingShingle | Hwa Sung Ryu Chang Gil Lim Tae Won Kang Seungmin Lim Hong Tae Kim Sang Heon Shin Evaluation of Corrosion Resistance of Corrosion Inhibitors for Concrete Structures by Electrochemical Testing in Saturated Ca(OH)2 Solutions with NaCl and Na2SO4 Advances in Materials Science and Engineering |
| title | Evaluation of Corrosion Resistance of Corrosion Inhibitors for Concrete Structures by Electrochemical Testing in Saturated Ca(OH)2 Solutions with NaCl and Na2SO4 |
| title_full | Evaluation of Corrosion Resistance of Corrosion Inhibitors for Concrete Structures by Electrochemical Testing in Saturated Ca(OH)2 Solutions with NaCl and Na2SO4 |
| title_fullStr | Evaluation of Corrosion Resistance of Corrosion Inhibitors for Concrete Structures by Electrochemical Testing in Saturated Ca(OH)2 Solutions with NaCl and Na2SO4 |
| title_full_unstemmed | Evaluation of Corrosion Resistance of Corrosion Inhibitors for Concrete Structures by Electrochemical Testing in Saturated Ca(OH)2 Solutions with NaCl and Na2SO4 |
| title_short | Evaluation of Corrosion Resistance of Corrosion Inhibitors for Concrete Structures by Electrochemical Testing in Saturated Ca(OH)2 Solutions with NaCl and Na2SO4 |
| title_sort | evaluation of corrosion resistance of corrosion inhibitors for concrete structures by electrochemical testing in saturated ca oh 2 solutions with nacl and na2so4 |
| url | http://dx.doi.org/10.1155/2019/8294360 |
| work_keys_str_mv | AT hwasungryu evaluationofcorrosionresistanceofcorrosioninhibitorsforconcretestructuresbyelectrochemicaltestinginsaturatedcaoh2solutionswithnaclandna2so4 AT changgillim evaluationofcorrosionresistanceofcorrosioninhibitorsforconcretestructuresbyelectrochemicaltestinginsaturatedcaoh2solutionswithnaclandna2so4 AT taewonkang evaluationofcorrosionresistanceofcorrosioninhibitorsforconcretestructuresbyelectrochemicaltestinginsaturatedcaoh2solutionswithnaclandna2so4 AT seungminlim evaluationofcorrosionresistanceofcorrosioninhibitorsforconcretestructuresbyelectrochemicaltestinginsaturatedcaoh2solutionswithnaclandna2so4 AT hongtaekim evaluationofcorrosionresistanceofcorrosioninhibitorsforconcretestructuresbyelectrochemicaltestinginsaturatedcaoh2solutionswithnaclandna2so4 AT sangheonshin evaluationofcorrosionresistanceofcorrosioninhibitorsforconcretestructuresbyelectrochemicaltestinginsaturatedcaoh2solutionswithnaclandna2so4 |